There are a lot of folks "into" the AD1862, AD1865, PCM56, PCM58, even PCM1702/1704. Good dac's really. But the I2S connection sans digital filter is always problematic. Wouldn't it be nice if the exa firmare or maybe even the driver software could be configurable for the DAC of choice. I mean this thing has 8 channels right? Why not for stereo split the I2S into L&R combatible format for these different DAC's. Just click the mouse to pick AD1865. It would be a huge advancement for all the NOS builders. Even if you aren't into NOS you could use the computer to upsample, which would allow a better analog filter. The potentital is there really, and with Hirez becoming more popular a 24/192 PCM1704 NOS DAC starts to make a lot of sense to even those not into NOS. Heck there are even reports of some new commercial NOS PCM1704 beating the PM2.

Just saying there is a potentital to really expand this. In a few years you can bet a lot of folks will be oversampling with their computer (custom PC digital filtering), this would be a step in that direction.

This is a great idea right here! Using software to make the exa compatible with all these old dacs should be possible. It could be incorporated in the exa dashboard. I'm running the AD1865 at 192 kHz in NOS mode right now, and it sounds absolutely terrific!